Thrust Reverser Actuator Mounting on Structural Arms to Relieve Casing Load
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Solution Overview
Problem
Conventional propulsion systems with sliding-grid thrust reversers face incompatibility with contemporary architectures due to reduced space around the external casing, leading to excessive loading and mechanical stress, particularly from the thrust reverser actuators.
Innovation Solution
An axially mobile structure reverser is implemented with an arm that supports actuator forces directly through a link structure and fastening means, reducing the load on the external casing by distributing forces through the arm and connecting structure, and optimizing the propulsion system's size and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional beam structure connecting actuators to flanges is used, then the actuator forces are transmitted to the external casing, but the external casing becomes excessively loaded and the linkage structure becomes incompatible with reduced space around the external casing
Solution Approach 1:
The patent introduces an intermediary support structure (the arm) that mediates between the actuator and the external casing. This arm is specifically designed to bear the actuator forces, preventing direct transmission to the external casing. The support structure acts as a force-distributing intermediary element that protects the external casing from excessive loading while maintaining actuator functionality.
Solution Approach 2:
The force transmission path is segmented into separate functional elements: the actuator, the arm (support structure), and the external casing. By segmenting the force transmission path, the patent isolates the actuator forces from the external casing, allowing each component to be optimized independently. The arm serves as a dedicated force-bearing element, while the external casing maintains its primary function without excessive mechanical loading.
2Adaptability or versatility
If the available space around the external casing is reduced for contemporary architectures, then the propulsion system adapts to high bypass ratio designs, but the conventional linkage structure cannot be accommodated
Solution Approach 1:
The patent repositions the support structure from a conventional in-plane linkage to a three-dimensional configuration. The arm extends in multiple dimensions (radially and axially) to provide optimal force transmission paths while accommodating reduced space constraints. This dimensional reconfiguration allows the linkage structure to fit within the compact architecture required for high bypass ratio propulsion systems.
Solution Approach 2:
The support structure is designed as a dynamic, adaptable component that can accommodate various operating conditions and spatial constraints. The arm's geometry and attachment points are configured to provide optimal performance across different thrust reversal configurations while maintaining compatibility with reduced space around the external casing.
3Strength
If the external casing is relieved of actuator forces, then the mechanical loads from the inverter are reduced, but additional support structures and fastening means are required
Solution Approach 1:
The arm serves multiple functions simultaneously: it supports actuator forces, provides a mounting structure for fastening means, and maintains the structural integrity of the external casing. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall device complexity while achieving the goal of relieving the external casing from actuator loads.
Data Source
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AI summary
The invention relates to a propulsion assembly comprising an actuator (40) connected to an outer casing (11) of a turbomachine by a connecting structure (45). The connecting structure (45) is fastened in line with a structural arm (12) connecting the outer casing (11) to a hub of the turbomachine, preferably by common fastening means (60, 61), with the result that the arm (12) can withstand loading forces of the actuator (40) while relieving the outer casing (11).